RequiredIf<T> class

A validation rule that checks if a value is required conditionally based on either a condition or the equality of another field's value.

This rule validates that the input value is required if a specified condition is met or if the value of another field is equal to a specified value.

Inheritance

Constructors

RequiredIf(String? otherFieldName, {required dynamic equalTo, String? message}): Creates a new instance of the RequiredIf validation rule based on the equality of another field's value.
RequiredIf.condition(bool condition()?, {String? message}): Creates a new instance of the RequiredIf validation rule based on a condition.

condition → (bool Function()?): The condition function that determines if the value is required.
final
equalTo → dynamic: The value to compare for equality against the other field's value.
final
hashCode → int: The hash code for this object.
no setterinherited
l10n → ValidatorLocalizations: The ValidatorLocalizations instance used for localization of validation messages. It's obtained through a service locator (sl) for convenience.
no setterinherited
otherFieldName → String?: The name of the other field to compare equality against.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

message(String fieldName) → String: Retrieves the validation message to be displayed.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited
validate(T value, Map<String, FormFieldState> fields) → bool: Validates the given value against the validation rule.
override
validatorMessage(String fieldName) → String: Retrieves the validator message for the field.
override